"We cannot think that four goals are sufficient. They are the best and are capable of anything," Aduriz said of Luis Enrique's side. "We are very satisfied. Barca scoring four goals is almost impossible, but [the second leg] is back [in Barcelona] and will be very hard."

Aduriz, who wrapped up his hat trick in a rampant 15-minute period in the second half at San Mames, said he wants to add to his tally at Barcelona.

"Keep doing what you've done to be very strong defensively and get a goal," said the 34-year-old, who has scored goals for Bilbao and Mallorca at Barcelona's famous home ground.

FOX Soccer and Goal.com have teamed up to bring you the best in world soccer coverage. Visit Goal.com, and follow them on Twitter and Facebook.